Connect L89H to STM32WL55JC1

IoT Modules GNSS Module
1

Hello All,

Recently I started working on the GNSS and I am very new to it. I have a IRNSS click which has L89H and I am trying to integrate L89H with STM32WL55JC1 controller.

I have implemented the UART with DMA to receive NMEA messages from the L89. I have connected TX, RX, 3,3v, GND pins to STM32’s RX, TX, 3.3v, and ground. But when I execute the code no NMEA messages are displayed on the serial monitor. I don’t know where I am going wring and I would appreciate to have help for me in this situation.

Please let me know if all the connections are correctly done or do I need to connect any additional pins to my STm32 controller. And if any additional information is required to debug the situation I am happy to share the details.

Kind regards,
Pavan

2

Hi Pavan_Ravuru,

Can you provide your hardware schematic to me via message?

Best regards.

3

Hello Raphael-Q,

Thanks for your response.

IRNSS click schematic diagram: [https://download.mikroe.com/documents/add-on-boards/click/irnss_click/IRNSS_click_v100_Schematic.PDF]

Please let me know if you need any other information.

Best regards,
Pavan

4

Hi Pavan_Ravuru,

There is no need to pull high RXD pin. I will send you L89 R2.0 Reference Design by message.

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Best regards.